A177224 a(n) is the least prime of the form ((2n+1)^k - (2n-1)^k)/2.

13, 609554401, 109, 193, 51001, 433, 44937854708156010721, 769

Offset

1,1

Comments

a(9) = (19^163 - 17^163)/2 is too large to include here.

Corresponding values of k (odd primes) are listed in A122478.

Links

Table of n, a(n) for n=1..8.

Formula

a(n) = ((2n+1)^A122478(n) - (2n-1)^A122478(n)) / 2.

Crossrefs

Cf. A122478, A028491, A121877.

Sequence in context: A145744 A174309 A081509 * A145234 A334634 A048847

Adjacent sequences: A177221 A177222 A177223 * A177225 A177226 A177227

Keyword

hard,nonn

Author

Alexander Adamchuk, May 05 2010

Extensions

Edited by Max Alekseyev, May 16 2010

Status

approved